Checksum

MD5:

SHA1:

Thanks for your interests.

Please read the Release Note carefully before updating firmware or installing software. Also, please be aware Zyxel is not responsible for damages if firmware, software, or other files are not installed according to the Release Note instructions. You can click to download the Release Note.

Notes to download the latest security gateway firmware:

We've made some changes to better serve you. Please log into your myZyxel account to obtain the latest firmware, ZLD4.25 for ZyWALL USG security gateway. Don't have an account yet? Sign up. Previous versions of firmware are still available on the Zyxel corporate website.